A little tip on rewarding your students for hard work:
Choose a food item that you yourself enjoy. That way when you scarf down two ice cream sandwiches in one sitting, you can say you are just cleaning up the leftovers!
Another little tip:
Choose a food item that makes you want to barf if you are trying to stay healthy... that way you won't be tempted to eat all the leftovers. In retrospect, I should have rewarded my students with some Beanboozled Jelly Beans.